An example can be hot dogs and hot dog buns. If the price of one of them falls, it would lead to the product being cheaper which would increase sales, thus bringing the demand for the other one to be much higher.
Marta is the subject of the sentence because she is performing the verb "Planned"
Answer:
I can't read off the unit that has only been assigned to you as you haven't shared a snip-it of the important details.
Explanation: